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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 216 · 40 questions
TalentJR

The trick (Choose a trick): × 9 → finger trick; × 4 → double double; × 10, 100, 1000 → slide and add zeros. 37, 12345679 or 111… → magic patterns; reverse and subtract → 1089. Puzzles: find the rule, the total or the leftover days, then check your answer.

NameDateTime takenScore ___ / 40
  1. 1.9 × 7 =
  2. 2.Half of 94 =
  3. 3.I thought of a number, multiplied it by 4 and added 5. I got 13. What was my number?
  4. 4.The ages of two twins add up to 22. How old is each twin?
  5. 5.Odd one out: which number is NOT in the 8 times table? (a) 40 (b) 16 (c) 55 (d) 64
  6. 6.9 × 3 = ?7 — what is the missing digit?
  7. 7.A piggy bank has 5 coins of ₹5 and 13 coins of ₹2. How many rupees are in it?
  8. 8.The 1st of a month is a Thursday. What day is the 28th of the same month? (a) Wednesday (b) Tuesday (c) Saturday (d) Thursday
  9. 9.Magic trick! Think of 10. Double it, add 18, halve it, then take away 10. What number do you get?
  10. 10.9 × 10 = ?0 — what is the missing digit?
  11. 11.9 × 5 = 4? — what is the missing digit?
  12. 12.Take 523. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  13. 13.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  14. 14.32 × 4 =
  15. 15.3 × 9 =
  16. 16.If today is Tuesday, what day was it 59 days ago? (a) Tuesday (b) Friday (c) Sunday (d) Saturday
  17. 17.9 × 8 = 7? — what is the missing digit?
  18. 18.15 × 4 =
  19. 19.A piggy bank has 8 coins of ₹5 and 12 coins of ₹2. How many rupees are in it?
  20. 20.40 × 4 =
  21. 21.Magic trick! Think of 15. Double it, add 6, halve it, then take away 15. What number do you get?
  22. 22.9 × 10 =
  23. 23.I thought of a number, multiplied it by 5 and added 9. I got 79. What was my number?
  24. 24.What comes next? 4, 8, 16, 32, ? (a) 64 (b) 56 (c) 65 (d) 48
  25. 25.9 × 4 =
  26. 26.1 + 3 + 5 + … + 9 =
  27. 27.Double 91 =
  28. 28.You have 9 coins. Each coin is ₹1 or ₹2, and together they make ₹14. How many ₹2 coins do you have?
  29. 29.Take 37 and take away the sum of its digits. What do you get?
  30. 30.1234 × 9 + 5 =
  31. 31.The 4th of a month is a Monday. What day is the 14th of the same month? (a) Wednesday (b) Thursday (c) Friday (d) Sunday
  32. 32.52 × 4 =
  33. 33.I thought of a number, multiplied it by 5 and added 7. I got 57. What was my number?
  34. 34.Magic square (every row, column and diagonal has the same total): 21 24 9 | 6 ? 30 | 27 12 15. What is the missing number?
  35. 35.9 × 4 = ?6 — what is the missing digit?
  36. 36.Take 825. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  37. 37.Half of 86 =
  38. 38.33 × 4 =
  39. 39.495 + 594 =
  40. 40.1234 × 8 + 4 =

Answer key

  1. 63
  2. 47
  3. 2
  4. 11
  5. 55
  6. 2
  7. 51
  8. Wednesday
  9. 9
  10. 9
  11. 5
  12. 198
  13. 792
  14. 128
  15. 27
  16. Saturday
  17. 2
  18. 60
  19. 64
  20. 160
  21. 3
  22. 90
  23. 14
  24. 64
  25. 36
  26. 25
  27. 182
  28. 5
  29. 27
  30. 11111
  31. Thursday
  32. 208
  33. 10
  34. 18
  35. 3
  36. 297
  37. 43
  38. 132
  39. 1089
  40. 9876

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